using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestVar
{
class Program
    {
static void Main(string[] args)
        {
//定义int数组
            int[] intAry = new int[] { 1, 2, 3, 4, 5, 6 };

//var varSet = intAry.Where(x => x > 3);
//执行Linq查询
            var varSet = from i in intAry where i > 3 select i;

//遍历查询结果
            foreach (var v in varSet)
            {
                Console.WriteLine(v);
            }

//输出varSet的类型名称与命名空间
            Console.WriteLine(varSet.GetType().Name);
            Console.WriteLine(varSet.GetType().Namespace);

            Console.ReadKey();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestVar
{
class AutoProperty
    {
public string Name { get; private set; }

public AutoProperty() { }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestVar
{
public static class Extend
    {
//第一个参数指定对String类型进行扩展
        public static string ReplaceA(this string str, string destStr)
        {
//将大写字母A转换为指定字串
            return str.Replace("A", destStr);
        }
    }
}

    class ClassA
    {
public int X { get; set; }
public int Y { get; set; }

public ClassA(int x)
        {
            X = x;
        }
    }

static void Main(string[] args)
        {
//普通类对象初始化，使用对象初始化器为Y赋值
            ClassA a = new ClassA(1) { Y = 2 };

//集合的初始化
            List<Point> points = new List<Point>
                                    {
new Point { X = 2, Y = 2 },
new Point { X = 3, Y = 3 },
                                    };

            Console.ReadKey();
        }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestVar
{
class Program
    {
static void Main(string[] args)
        {
//定义两个匿名类型对象，属性名称、值均相同
            var firstCar = new { Color = "Red", Name = "BMW" };
            var secondCar = new { Color = "Red", Name = "BMW" };

//Object.Equals方法比较两个匿名类型对象是否相等
            Console.WriteLine(firstCar.Equals(secondCar));
//使用==操作符比较两个匿名类型对象是否相等
            Console.WriteLine(firstCar == secondCar);
//比较两个匿名类型是否同一类型
            Console.WriteLine(firstCar.GetType().Name == secondCar.GetType().Name);

            Console.ReadKey();
        }
    }
}